Degree of curvature

Degree of curvature
This article is about the measure of curvature. For other uses, see degree (angle).

Degree of curve or degree of curvature is a measure of curvature of a circular arc used in civil engineering for its easy use in layout surveying.

A n-degree curve turns the forward direction by n degrees over some agreed-upon distance. The usual distance in US road work is 100 ft (30.48 m) of arc[1]. US railroad work traditionally used 100 ft of chord and this may be used in other places for road work. Other lengths may be used—such as 100 metres where SI is favoured, or a shorter length for sharper curves.

Since rail routes have very large radii, they are laid out in chords, as the difference to the arc is inconsequential and this made work easier before electronic calculators.

The 100 ft (30.48 m) is called a station, used to define length along a road or other alignment, annotated as stations plus feet 1+00, 2+00 etc. Metric work may use similar notation, such as kilometers plus meters 1+000.

See also

References

  1. ^ Davis, Foote, and Kelly. Surveying Theory and Practice, 1966

External links

Note the variation in usage among these samples.

v · d · eRailway infrastructure
Permanent way
Permanent way (history) • Permanent way (current) • Railroad tie/Sleeper • Rail fastening system • Track ballast • Rail profile • Fishplate  • Breather switch • Datenail • Axe ties • Ladder track • Baulk road • Cant • Minimum radius  • Track transition curve
Trackwork and track structures
Junction • Wye • Railroad switch • Gauntlet track • Railway electrification system • Overhead lines • Track gauge • Railway turntable • Water crane • Track pan • Rail track • Tramway track • Classification yard  • Rail yard • Siding • Passing loop • Balloon loop
Signalling and safety
Railway signalling • Signalling control • Railway signal • Interlocking • Level crossing • Buffer stop • Catch points • Loading gauge • Structure gauge • Block post
Buildings
Train station • Station building • Train shed • Goods shed • Motive power depot • Roundhouse
v · d · eRailway track layouts
Running lines
Single track • Passing loop • Double track • Quadruple track • Crossover
Rail sidings
Junctions
Stations
Hillclimbing

Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Degree of curvature — Кривизна; Радиус кривизны (при изгибании гальваностереотипов) …   Краткий толковый словарь по полиграфии

  • Degree — may refer to: Contents 1 As a unit of measurement 2 In mathematics 3 In education …   Wikipedia

  • Curvature — In mathematics, curvature refers to any of a number of loosely related concepts in different areas of geometry. Intuitively, curvature is the amount by which a geometric object deviates from being flat, or straight in the case of a line, but this …   Wikipedia

  • Curvature — Cur va*ture (k?r v? t?r; 135), n. [L. curvatura. See {Curvate}.] 1. The act of curving, or the state of being bent or curved; a curving or bending, normal or abnormal, as of a line or surface from a rectilinear direction; a bend; a curve. Cowper …   The Collaborative International Dictionary of English

  • Curvature of the spine — Curvature Cur va*ture (k?r v? t?r; 135), n. [L. curvatura. See {Curvate}.] 1. The act of curving, or the state of being bent or curved; a curving or bending, normal or abnormal, as of a line or surface from a rectilinear direction; a bend; a… …   The Collaborative International Dictionary of English

  • curvature — ► NOUN ▪ the fact of being curved or the degree to which something is curved …   English terms dictionary

  • degree —    1. (° or deg)    the standard unit of angle measure, equal to 1/360 circle, 60 minutes, 3600 seconds, or about 0.017 453 293 radian. So far as we know, this unit was introduced by the Greek geometer Hipparchus of Nicaea (ca. 180 ca. 125 BC),… …   Dictionary of units of measurement

  • curvature — /kerr veuh cheuhr, choor /, n. 1. the act of curving or the state of being curved. 2. a curved condition, often abnormal: curvature of the spine. 3. the degree of curving of a line or surface. 4. Geom. a. (at a point on a curve) the derivative of …   Universalium

  • Curvature invariant — In Riemannian geometry and pseudo Riemannian geometry, curvature invariants are scalar quantities constructed from tensors that represent curvature. These tensors are usually the Riemann tensor, the Weyl tensor, the Ricci tensor and tensors… …   Wikipedia

  • curvature — cur|va|ture [ˈkə:vətʃə US ˈkə:rvətʃər] n [U and C] technical [Date: 1400 1500; : Latin; Origin: curvatura, from curvare; CURVE2] the state of being curved, or the degree to which something is curved curvature of ▪ the curvature of the Earth s… …   Dictionary of contemporary English

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”